diff --git a/incubation/reflection/lib/src/mirrors/mirror_system.dart b/incubation/reflection/lib/src/mirrors/mirror_system.dart
index 787c789..d5198f1 100644
--- a/incubation/reflection/lib/src/mirrors/mirror_system.dart
+++ b/incubation/reflection/lib/src/mirrors/mirror_system.dart
@@ -261,6 +261,9 @@ class MirrorSystem implements MirrorSystemContract {
 
   @override
   TypeMirrorContract reflectType(Type type) {
+    if (!Reflector.isReflectable(type)) {
+      throw ArgumentError('Type is not reflectable: $type');
+    }
     return _getOrCreateTypeMirror(type);
   }